Body mass index and waist-to-hip ratio misclassification of overweight and obesity in Chinese military personnel

Table 3 Rates of false positives or negatives of BMI- and WHR-defined obesity based on the criteria of BFP

Obesity status	BFP standard^a		P value		Obesity status	BFP standard^a		P value
Obesity status	Overweight/obese (BFP ≥ 22%)	Non-overweight/non-obese (BFP < 22%)	P value	Rates of false positive or negative	Obesity status	Overweight/obese (BFP ≥ 22%)	Non-overweight/non-obese (BFP < 22%)	P value	Rates of false positive or negative
Military personnel
Overweight/obese (BMI ≥ 24 kg/m2)	14	65	< 0.01	False positive 19.2% (65/339)	Obese (WHR ≥ 0.91)	13	47	< 0.01	False positive 13.9% (47/339)
Non-overweight/non-obese (BMI < 24 (kg/m2)	0	274	< 0.01	False negative 0% (0/14)	Non-obese (WHR < 0.91)	1	292	< 0.01	False negative 7.1% (1/14)
Age-matched control group
Overweight/obese (BMI ≥ 24 (kg/m2)	22	18	0.076	False positive 5.1% (18/350)	Obese (WHR ≥ 0.91)	26	19	< 0.01	False positive 5.4% (19/350)
Non-overweight/non-obese (BMI < 24 (kg/m2)	8	332	0.076	False negative 26.7% (8/30)	Non-obese (WHR < 0.91)	4	331	< 0.01	False negative 13.3% (4/30)

Note: BMI body mass index, BFP body fat percentage, WHR waist-to-hip ratio
^aFor each analysis, BFP served as standard and BMI or WHR-based categories as “screening tests”
False-positive and false-negative rates were calculated using following equations: False positive rate = BMI or WHR^{overweight/obese} BFP^{nonoverweight/nonobese}/BFP ^{nonoverweight/nonobese}. False negative rate = BMI or WHR^{nonoverweight/non obese} BFP^{overweight/obese}/BFP^{overweight/obese}. The numbers in the parenthesis were represented according to the formulas of calculating false positive/negative rates above

ISSN: 1880-6805